Fourier at Spartan 3e PLICE

Good afternoon! I need a spectroanalyzer on the FPIS, Plis spartan 3e with LCD 16:2. That is, the implementation of the Fourier transform on the Plate language is not important VHDL or believed Ise Project Navigator design environment is desirable. The price is negotiated, there are ready but I can not tie them to the existing FPI. I'm waiting for your answer as soon as possible.